Table 1.
List of price and source of commercial crutches.
Fig 1.
Dimensional measurements of assembled crutch. a) length of forearm 227 mm, l) length of leg section 794 mm.
Fig 2.
Forearm design (a) top view, featuring (x) cuff depth and (y) cuff width; (b) right view; (c) isometric view.
Fig 3.
Design of (a) washer (TPU-85A), (b) handle grip (TPU-85A).
Fig 4.
Design of (a) foot cushion (TPU-85A), (b) foot base (PETG), (c) foot living joint (TPU-85A), (d) ankle body (PETG), and (e) assembled foot tip.
Table 2.
Bill of materials for 3D printed components.
Table 3.
Slicing parameters for PETG and TPU 85A filaments.
Fig 5.
Orientation of the 3D printed one-piece forearm (blue) on the print bed with support locations (green).
Fig 6.
Mechanical testing jig and forearm crutch mounted in the hydraulic press.
Fig 7.
3D printed Forearm (PETG) (a) front view, (b) top view, (c) side view.
Fig 8.
3D printed (a) Handle Grip, (b) Foot cushion, (c) Foot, (d) Foot living joint, (e) Foot body, (f) Washer, and (g) Assembled Foot tip.
Fig 9.
(a) Assembled crutch, (b and c) Two crutches in use.
Table 4.
Summary of the failure maximum compressive loads.
Fig 10.
Compressive load vs displacement for the one-piece forearm crutch.
Fig 11.
Failure points for each of the 2 types of failure.
Table 5.
3D printed parts weight, price, and time breakdown.
Table 6.
Cost calculation of the open-source crutch.
Fig 12.
Gaussian distribution of masses of Canadian men and women in comparison to the average weight a pair of crutches can support under dynamic conditions (154 kg) using a safety factor of 2.